pisrt – Page 34

Steady-state solutions for modified Stokes’ second problem of Maxwell fluids with power-law dependence of viscosity on the pressure

OMS-Vol. 6 (2022), Issue 1, pp. 14 – 24 Open Access Full-Text PDF

Constantin Fetecau and Dumitru Vieru

Abstract:Analytical expressions for the steady-state solutions of modified Stokes’ second problem of a class of incompressible Maxwell fluids with power-law dependence of viscosity on the pressure are determined when the gravity effects are considered. Fluid motion is generated by a flat plate that oscillates in its plane. We discuss similar solutions for the simple Couette flow of the same fluids. Obtained results can be used by the experimentalists who want to know the required time to reach the steady or permanent state. Furthermore, we discuss the accuracy of results by graphical comparisons between the solutions corresponding to the motion due to cosine oscillations of the plate and simple Couette flow. Similar solutions for incompressible Newtonian fluids with power-law dependence of viscosity on the pressure performing the same motions and some known solutions from the literature are obtained as limiting cases of the present results. The influence of pertinent parameters on fluid motion is graphically underlined and discussed.

Filters and compactness on small categories and locales

OMS-Vol. 6 (2022), Issue 1, pp. 1 – 13 Open Access Full-Text PDF

Joaquín Luna-Torres

Abstract: In analogy with the classical theory of filters, for finitely complete or small categories, we provide the concepts of filter, $\mathfrak{G}$-neighborhood (short for “Grothendieck-neighborhood”) and cover-neighborhood of points of such categories, to study convergence, cluster point, closure of sieves and compactness on objects of that kind of categories. Finally, we study all these concepts in the category $\mathbf{Loc}$ of locales.

A prospective study for assessment of cases of dengue fever in pediatric patients

TCMS-Vol. 1 (2021), Issue 4, pp. 10 – 14 Open Access Full-Text PDF

Abhay Bhatnagar, Alok Kumar Deodia, Amit Maheshwari, Sandeep Ahlawat

Abstract:Aim: To assess cases of dengue fever in Pediatric patients.
Methodology: Sixty-eight pediatric cases of dengue of both genders were included in the study. Clinical features and laboratory findings were recorded. Statistical analysis was performed using appropriate tests.
Results: Out of 68 patients, boys were 38, and girls were 30. Common symptoms were fever in 95%, vomiting in 68%, loose stools in 22%, periorbital puffiness in 10% and respiratory distress in 26, pain abdomen in 47% cases. The mean hemoglobin level at admission was 12.6 gm% and at discharge was 12.7gm%. The mean TLC was 56210 cumm of blood at admission, and at discharge was 122452 cumm of blood.
Conclusion: Common symptoms were fever, vomiting, respiratory distress and pain abdomen. Hence careful evaluation of dengue in children is required.

Correlation between diabetes mellitus and thyroid dysfunction

TCMS-Vol. 1 (2021), Issue 4, pp. 6 – 9 Open Access Full-Text PDF

S. Srinivas

Abstract:Aim: To assess relation between diabetes mellitus and thyroid dysfunction.
Methodology: 105 type II diabetes mellitus patients of both genders were included. Serum TSH (Thyroid Stimulating Hormone), free $T_3$ (Triiodothyronine) and free $T_4$(Thyroxine) were determined in all enrolled patients.
Results: There were 50 males and 55 females in the present study. Age group 21-30 years had 15 patients, 31-40 years had 26, and 41-50 years had 64 patients. Duration of diabetes was 8.4 years, and the level of glycosylated hemoglobin (HbA1C) was 9.2 years. A significant difference was observed (P< 0.05). Serum T3 was increased by 15% and decreased by 4%. Free T3 was increased in 5% and decreased in 13%, and free T4 was increased in 7% and decreased in 5%. There were 20 hypothyroidism and 29 hyperthyroidism patients. Maximum hypothyroidism patients (12) and hyperthyroidism patients (14) were seen with >7 HbA1C levels.
Conclusion: Most of the type II DM patients had hypothyroidism than hyperthyroidism.

Assessment of cases of pregnancy induced hypertension- A clinical study

TCMS-Vol. 1 (2021), Issue 4, pp. 1 – 5 Open Access Full-Text PDF

Mozafar Khazaei, Ataur Kamal Rashid

Abstract:Aim: To assess cases of pregnancy induced hypertension.
Materials & Methods: Our study included 74 cases of pregnancy-induced hypertension. Parameters such as age, marital status, education, parity, etc., were recorded.
Results: Age group (years) <20 had 30%, 20-24 had 45%, 25-29 had 16%, 30-34 had 5% and >35 had 4% cases. Education level was illiterate in 40% and literate in 60%, and marital status was married in 58%, single in 26% and divorced in 16$, parity was 0 in 24%, 1-2 in 46% and >2 in 30%, gravida was primi in 40% and multi in 60%, previous PIH was seen in 24% patients. Family history of DM was observed in 25%, family history of PIH in 18%, family history of hypertension was seen in 10%, history of asthma was seen among in 8\% and history of kidney disease 30% patients. The difference was significant (P< 0.05).
Conclusion: Common risk factors of pregnancy induced hypertension was family history history of asthma, hypertension, family history of PIH, family history of DM, history of kidney disease.

Predicting COVID-19 cases, deaths and recoveries using machine learning methods

EASL-Vol. 4 (2021), Issue 4, pp. 43 – 49 Open Access Full-Text PDF

Mohamed Lounis, Farhan Mohammad Khan

Abstract:In the presented work we applied three machine learning techniques to forecast and predict COVID-19 cases, deaths ad recoveries numbers in Algeria for the next six months using data from February 25th, 2020 to April 26th , 2021. These models are represented by the Gaussian process regression (GPR), the support vector machine (SVM) and the decision tree (DT). The plotting results and parameters evaluation pointed out that the Gaussian Process Regression (GPR) has the best performance. Prediction with this model showed that the number of cases, deaths and recoveries will increase in the next months Algeria recording a peak in the month of August and the curve will tend to decrease later.

Dependence of reflectance on angular deposition and film thickness of ZnS/Ag nanolayers

EASL-Vol. 4 (2021), Issue 4, pp. 26 – 42 Open Access Full-Text PDF

Edward Bwayo, Willy Okullo, Daniel Mukiibi, Denis Okello, Robert Lugolole, Tumps Winston Ireeta

Abstract:This paper presents the spectral reflectance of thermally evaporated ZnS/Ag nanostructures. The coating of ZnS/Ag nanostructures was performed in two steps while varying the film thickness and deposition angle. Silver metal wire (99.99% purity) was heated under vacuum at a pressure of $2.5 \times 10^{-5}$ mBars and deposited on glass slide substrates in the diffusion pump microprocessor vacuum coater (Edwards AUTO 306). Pieces of zinc sulphide (99.99% purity) were heated and deposited to the glass slides previously coated with silver to form the ZnS/Ag/glass composite. The optical reflectance of the samples was studied by the UV/Vis/NIR spectrometer (Perkin Elmer Lambda 19) with UV-WinLab software. The reflectance was measured at angles of incidence between $15^o$ and $75^o$. Spectrophotometric studies showed that reflectance decreased with decrease in film thickness and decreased with increase in deposition angle of silver nanoparticles. The reflectance of ZnS/Ag nanostructures decreased with increase in deposition angle of zinc sulphide.

Gallery of integrating factors for non-linear first-order differential equations

EASL-Vol. 4 (2021), Issue 4, pp. 17 – 25 Open Access Full-Text PDF

Albert Adu-Sackey, Gabriel Obed Fosu, Buckman Akuffo

Abstract:This paper discusses a gallery of useful results in connection with integrating factors that are often left as problems for discovery learning and are generally not taught in typical Ordinary Differential Equations courses. Most often than not the approach earlier writers employ is to give a possible form for an integrating factor that may results in an integrating curve without practical prove as far as the subject matter is concerned. In this write-up, an attempt is made by solving the resulting partial differential equation emanating from an underlining general differential equation of a non-exact form, by the use of the ratio theorem to establish various intricate possibilities of integrating factors that are seldom and often relegated to the background, even though they may be equally be applied as a function of a unitary variable or a linear combination of both the dependent and independent variables under certain conditions. Granted an integrating factor is found and such a function applied, the benefit is enormous especially the non-exact differential equation reduces into a known type which may be identified as exact, homogeneous, and or separable that yields a solution.

The relationship between the energy efficiency of buildings and occupants: A review

EASL-Vol. 4 (2021), Issue 4, pp. 5 – 16 Open Access Full-Text PDF

Muhammad Usman Farooq, Abdul Ahad, Zeeshan Maqsood, Niranjan Devkota, Syed Naqi Raza

Abstract:Green buildings are supposed to provide a sustainable solution for energy usage, but their low performance raised some questions in the literature. The researchers determine that occupants are the key factor for this energy deficiency. In the last two decades, a stream of research focuses on the greening of occupants, but a synthesis of findings and results are absent in the literature. In this study, we reviewed the literature on green buildings and occupants. Based on the findings we classified four classes. The first class consists of green occupants and green buildings, which is the ideal solution for high-energy efficiency. The second class is of brown occupants and green buildings and is the prime reason behind outperformed green buildings and yields negative-medium level efficiency. The third class comprises green occupants and brown buildings and yields positive-medium level efficiency, which helps to start the journey towards sustainability. The fourth class is the combination of brown buildings and brown occupants and has the lowest efficiency and worst impact on the environment throughout the lifecycle. Further, we link these classes with the energy-saving efficiency of buildings and finally recommended an efficient solution for second and third world countries. The study contributes to green building literature and packed with managerial implications to gain the maximum benefits of green buildings.

Digital high-speed data modulation techniques

EASL-Vol. 4 (2021), Issue 4, pp. 1 – 4 Open Access Full-Text PDF

Winston Tumps Ireeta, Esther Nabadda, George Isoe

Abstract:Most radio stations use frequency modulation (FM) to broadcast yet amplitude modulation (AM) ensures long distance modulation. The limitations of FM reception are the line of sight and the area of reception. These two parameters are much smaller in FM compared to AM which makes AM modulation have an added advantage over FM modulation. The results presented in this paper include; direct modulation at different bias currents and different transmission fiber lengths and the amplitude modulation using the Mach-Zehnder. The results show the possibility to transmit huge data at high speeds to over 100Gbps.

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